Hardin is a surname. Notable people with the surname include:
Brian Hardin (born 1965), American politician from Nebraska
Charles Hardin Holley (1936–1959), birth name of Buddy Holly
Charles Henry Hardin (1820–1892), co-founder of Beta Theta Pi fraternity
Chelsea Hardin, American beauty queen
Clifford M. Hardin, American politician, Secretary of Agriculture
DeVon Hardin, American basketball player
Garrett Hardin (1915–2003), American ecologist
George A. Hardin (1832–1901), New York lawyer and politician
Glen Hardin, American musician/piano player
Glenn Hardin (1910–1975), American athlete
Jerry Hardin, American actor
Jim Hardin (1943–1991), American baseball player
Jo Hardin, American statistician
John Hardin (1753–1792), American army officer
John J. Hardin (1810–1847), American politician from Illinois
John Wesley Hardin (1853–1895), American outlaw and gunfighter
Joseph Hardin Sr. (1734–1801), American soldier and politician
Julia Hardin, American baseball player
Lil Hardin Armstrong (1898–1971), American jazz musician, second wife of Louis Armstrong
Louis T. Hardin (1916–1999), American musician known as Moondog
Martin Davis Hardin (1837–1923), American general
Martin D. Hardin (1780–1823), American politician from Kentucky
Melora Hardin, American actress
Paul Hardin Jr. (1903–1996), American bishop
Rusty Hardin, American attorney
Salvor Hardin, fictional character in Isaac Asimov's Foundation series
Terri Hardin, American puppeteer
Tim Hardin (1941–1980), American folk musician and composer
Ty Hardin (1930–2017), American actor